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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <assert.h>
#include "command.h"
#include "conn_data.h"
#include "db.h"
#include "runloop.h"
#include "user_data.h"
#define PORT (29536) // python: int("msg",36)
static int create_server_socket(void){
int sock=socket(AF_INET,SOCK_STREAM,0);
if(sock<0)die_perror("socket");
int one=1;
setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&one,sizeof one);
struct sockaddr_in name;
name.sin_family=AF_INET;
name.sin_addr.s_addr=htonl(INADDR_ANY);
name.sin_port=htons(PORT);
if(bind(sock,(struct sockaddr*)&name,sizeof name)<0)die_perror("bind");
if(listen(sock,16)<0)die_perror("listen");
return sock;
}
struct hash_item{
struct conn_data cd;
struct hash_item *next;
};
#define CONN_HASH_SIZE (16)
static struct hash_item *conn_hash[CONN_HASH_SIZE];
static struct conn_data* find_conn_data(int fd){
struct hash_item *item=conn_hash[fd%CONN_HASH_SIZE];
while(item&&item->cd.fd!=fd)item=item->next;
assert(item);
return &item->cd;
}
static void delete_conn_data(int fd){
debug("Deleting conn_data for fd=%d",fd);
struct hash_item *item=conn_hash[fd%CONN_HASH_SIZE];
assert(item);
if(item->cd.fd==fd){
if(item->cd.userid!=-1)userdata_unregister(item->cd.userid,fd);
conn_hash[fd%CONN_HASH_SIZE]=item->next;
conn_data_nullify(&item->cd);
free(item);
return;
}
struct hash_item *parent=NULL;
while(item&&item->cd.fd!=fd){
parent=item;
item=item->next;
}
assert(parent);
assert(item);
if(item->cd.userid!=-1)userdata_unregister(item->cd.userid,fd);
conn_data_nullify(&item->cd);
parent->next=item->next;
free(item);
}
static bool client_socket_callback(int fd){
struct conn_data *data=find_conn_data(fd);
if(data->bufsz-data->buflen<256){
data->bufsz*=2;
data->buffer=realloc(data->buffer,data->bufsz,char);
}
ssize_t ret;
do ret=read(fd,data->buffer+data->buflen,data->bufsz-data->buflen);
while(ret<0&&errno==EINTR);
if(ret<0)die_perror("read");
if(ret==0){
delete_conn_data(fd);
close(fd);
return true;
}
data->buflen+=ret;
char *lfp=memchr(data->buffer,'\n',data->buflen);
if(lfp==NULL)return false;
size_t length=lfp-data->buffer;
bool should_close=handle_input_line(data,data->buffer,length);
memmove(data->buffer,lfp+1,data->buflen-length-1);
data->buflen-=length+1;
if(should_close){
delete_conn_data(fd);
close(fd);
return true;
}
return false;
}
static bool server_socket_callback(int fd){
int sock;
do sock=accept(fd,NULL,NULL);
while(sock<0&&errno==EINTR);
if(sock<0)die_perror("accept");
runloop_add_fd(sock,client_socket_callback);
struct hash_item *item=malloc(1,struct hash_item);
conn_data_init(&item->cd,sock);
item->next=conn_hash[sock%CONN_HASH_SIZE];
conn_hash[sock%CONN_HASH_SIZE]=item;
debug("Added conn_data for fd=%d",sock);
return false;
}
#ifndef __APPLE__
void srandomdev(void){
FILE *f=fopen("/dev/urandom","r");
assert(f);
unsigned int seed;
size_t nread=fread(&seed,1,sizeof(seed),f);
assert(nread==sizeof(seed));
fclose(f);
srandom(seed);
}
#endif
int main(void){
srandomdev();
db_init();
int sock=create_server_socket();
printf("Listening on port %d\n",PORT);
runloop_add_fd(sock,server_socket_callback);
runloop_run();
db_close();
}
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